Five member microscope objective having a magnification of 100x



FIVE MEMBER MICROSCOPE OBJECTIVE HAVING A MAGNIFICATION OF 100X Filed Dec. 11, 1968 INVENTOR. ARTHUR H. SHOEMAKER A T TORNE. Y

3,537,772 Patented Nov. 3, 1970 DRAWING 3 537 772 In the drawing, a microscope objective is represented FIVE MEMBER MICROSCOPE OBJECTIVE by a plurality of lenses viewed transversely to their axis.

HAVING A MAGNIFICATION F 100x Arthur H. Shoemaker, East Aurora, N.Y., assignor to DESCRIPTION American Optical Corporation, Southbridge, Mass., a corporation of Delaware Referrin now to the drawing, a microscope ob ective Filed Dec. 11, 1968, Ser. No. 783,078 is generally shown at 2. It includes a front doublet 4, t (1 G02!) 9/ 21/02 a single lens 6, a doublet 8, a doublet 10, and a doublet 12, 2 Claims all of said lenses being in axial alignment. Objective 2 is disposed relative to an object plane 14 as shown in the drawing. A capillary oil space exists between plane 14 and doublet 4. Positive doublet 4 includes a plane-convex lens I and a concavo-convex lens II. Lens 6 is a concavo- ABSTRACT OF THE DISCLOSURE convex positive meniscus shaped lens, also designated as III. A five member microscope objective having a numerical Doublet 8 Includes a convexconfiavo lens and a aperture of substantially 1.25 and a magnification of subdouble convex lens togethef formmg a Positive double, n 100 convex doublet. Doublet 10 includes a convex-concavo stantia y X.

lens VI and a double convex lens VII, together forming a negative double convex doublet. Doublet 12 includes a double convex lens VIII and a double concave lens IX, together forming a negative convex-concave doublet. The lens parameters are as follows: The successive BACKGROUND OF THE INVENTION lens radii are designated R1-R14 where a minus sign Th 1 indicates radii on centers of curvature lying on the object A e gf i re to a.mlcr.oscope f side of their vertices. The axial thicknesses of successive n 0 e prfisem invention 15 F P a lens elements are designated Tl-T9. The successive axial achromapc 011 lmmerslon m'CrPSCOPC objective having spaces from the object plane 14 are designated 81-85. The a .umencal apertu.re of substantially and a i refractive indices of the successive lens elements are desigcatron of substantially 100x, 1n WhlCh chromatlc and Hated ND1 ND9' The Abbe numbers of the successive spherical aberrations, coma, and astigmatism are well corlens glasses are designated respectively a 'g yethprovidling a Subsbtamiany flatdimagg g The above-mentioned parameters are related to the w en use wit a te esco e o 'ective as escri e in US. Pat No- 3355234. P J going: length according to the following constructional lMagnification=X N.A.=1.25]

Lens Radius, R Thickness, T Space, B Refractive Abbe lndex, ND Number, v

S1=.l75lF R1=Plano I 'll=.3064F ND1=1.51700 vl=64.50

R2=.8838F II .l T2=1.6108F ND2=L80264 v2=46.75

R3=l.4258F S2=.0l09F R4=6.3949F IlI T3=1.0669F ND3=1.78833 v3=50.47

S3=.1641F R6=3.9667F IV T4=.5471F ND4=1.64316 v4=47.95

R7=2.8872F V T5=1.9484F ND5=1.43381 5=94.93

R8=-7.2l02F s4=.01a7F R9=22A665F vr T6=A377F ND6=1.78444 v6=26.06

R10=2.6547F VII T7=1.7640F ND7=1A3381 v7=94.93

R11=7.7l08F S5=10.3660F R12=12.0831F VIII.. T8=1.1577F ND8=L78446 v8=25.75

Rl3=-3.3715F IX T9=1.0806F ND9=1.67252 9=32.30

The foregoing parameters of radius, thickness and space are based on the value of F. The value of F in this case, as an example, is 1.8277. Given in numbers, the foregoing data is as follows:

said front and second members forming a doublet; a third concavo-convex lens member HI;

a fourth convex-concavo lens member IV;

a fifth double convex lens member V;

[F=1.827-7 MaguificutlonzlOOX N.A.:1.25]

Lons Radius, R Thickness, '1 Space, S Refractive Abbe v,

index, ND Number Sl= .32 R1= Plano I '11=.56 ND1=1.5I700 v1=64.50

R2 1.653 II T2=2.944 ND2=L80264 v2=46.75

III T3=1.950 ND3=L78833 v3=50.47

S3= .300 R6=7.250 IV T4=1.000 ND4=L64316 v4=47.95

R7 =5.277 V T6=3.56I ND5=L4338I v5=94,93

S4= .025 R9=4L062 VI T6=.801 N D6=1.78444 u6=26.06

R10=4.852 VII T7=3.224 ND7=L43381 v7=94.93

S5=18.946 RI2=23.912 VIII T8=2.1l6 ND8=L78446 v8=25.75

R13= 8.102 IX T9=L975 ND9=1.67252 v9=32.20

It will be apparent that the foregoing absolute values are variable depending on the value of F. Other forms are thus possible and changes may be made in the values of the constructional data based on the relationships in the first of the above charts, without departing from the spirit of this invention.

What is claimed is:

1. An achromatic-microscope objective having a magnification of substantially 100x and a numerical aperture of substantially 1.25 for forming an image of an object plane, said image being well corrected for spherical and chromatic aberrations, coma, astigmatism and curvature of image field, said objective comprising:

a front piano-convex lens member I; a second concave-convex lens member II;

the parameters of lens radii (RI-R14), lens thicknesses (Tl-T9), axial spaces among lens elements and object plane (SlS5), refractive indices (NDl-ND9), and Abbe numbers (vb-v9), being determined by the following relationship:

a front lano-convex lens member I;

an eighth double convex lens member VIII; a ninth double concave lens member IX; said eighth and ninth members forming a doublet; all of said lens members being axially aligned; and

Abbe numbers (VI-V9) are as follows:

the parameters of lens radii (RI-R14), lens thicknesses (Tl-T9), axial spaces among lens elements and object plane (Sl-S5), refractive indices (NDl-ND9), and

Refractive Abbe Lens Radius, R Thickness, '1 Space, S Index, ND Number, v

S! 32 R1 Plano I T1=.56 ND1=1.51700 vl=64.50

R2 =1.653 II T2=2.944 ND2=L80264 v2=46.75

S2= .020 R4= 11.688 III T3=l.950 ND3=1.78833 v3=50.47

S3=.300 R0=7.250 IV T4=1.000 ND4=1.64316 v4=47.95

R7= 5.277 V T5=3.561 ND5=1.43381 v5=94.93

R8= l3.l78

S4 .025 R9=4L062 VI T6=.801 ND6=1.78444 v6=26.06

R10 =4.852 VII T7=3.224 ND7=L43381 v7=94.93

S5=18.946 R12 =23.9l2 VIII T8=2.116 ND8=1.78446 v8=25.75

R13= 6.162 IX l. T9=L975 ND9=1.67252 v9i=32.20

wherein scalar values are given in millimeters.

References Cited UNITED STATES PATENTS 5/1964 Muller et a1.

JOHN K. CORBIN, Primary Examiner US. Cl. X.R. 

